Electric heater.



Patented my la, |902.

M. c. BuRT.I ELEcTmc HEATER.

(Application led Oct. 3Q, 1901.)

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wif-kwamen UNITED STATES PATENT OFFICE.

MARTIN C. BURT, OF CHICAGO, ILLINOIS.

ELECTRIC HEATER SPECIFICATION forming part of Letters Patent No. 699,651, dated May 13, 1902.

Application tiled October S0, 1901. Serial No. 80,549. (No model.)

To all whom, it may concern:

Be it known that I, MARTIN C. BURT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electric Heaters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in electric heaters, and is embodied in the construction and arrangement of parts presently tobe described,anddenedin the claims.

The invention is designed more particularly for car-heating purposes, but it may be employed for heating purposes generally; audit comprehends in its structure a supporting member in the form of au air-conduit, means for forcing air through the conduit, suitable resistance material supported on the air-conduit, and a special arrangement of the resistance, so that variation in the heat may be secured.

In the drawings accompanying this application, Figure 1 is an elevation of a section of a car, showing a series of heaters. Fig. 2 is a longitudinal section through one of the heaters, showing parts in elevation; and Fig. 3 is a transverse section through one of the heaters.

A designates a car-body having, conveniently under the seats, heating-boxes B,which are closed throughout except at the front, over which suitable gratings may be placed.

C designates a pipe or conduit leading from a blower C', whichlatter is actuated in any convenient 'mannen preferably by a small electrical motor D. The conduit C extends the length of the car and is made in perforate and imperforate sections c c. The perforate sections of the conduit are located in the heating-boxes, while the extreme cuter end of the conduit is closed. Surrounding the perforated sections are the heating-coils E and plates or disks F, the former consisting of a wire coil extending around the conduit,which latter is conveniently formed of insulated material. The resistance or heating surfaces F consist of a series of plates having numerous perforations therein and are secured to the insulated perforated pipe-sections. These plates are coupled up by connectionsfin series. The continuous wire coil Eis passed into an opening in the perforated pipe-section under the edge of the adjacent disk F and then out and around the exterior of the pipe. This is continued throughout the perforated section.

` The resistancesE F are connected with suitable feed-wires G II, which are provided with suitable switches, the wires being of diierent diameter,so that a stronger current can be sent through the plate resistance than through the coil resistance, and as each of the conductors is independently controlled andthe vresistances being insulated from each other a larger amount of heat can be secured when the current is passing through the plate resistance than through the coil resistance. By this construction and arrangement a moderate heat can be produced by the use of the coil, and should necessity require an increased amount of heat can be produced by the use of the plates, with their large radiating-surfaces. Both resistances can be used7 if desired. By perforating the plates F an extended resistance-surface is produced without the necessity of increasing the amount of current to render the same incandescent.

In operation the air is constantly blown through the support or conduit, the same issuing through the perforations therein between the resistance-plates and the resistancecoil in all directions, and as the box which contains the heater is open only at the front the air will find exit from the front into the body of the car. Y

Many minor changes may be made in the arrangement and construction of the apparatus without departing from the nature and principle of the invention.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is- A l. In an electrical heater, the combination with a hollow supporting member having an insulated perforated section,of a series of resistance-plates F secured on the section, a resistance-coil surrounding the perforated section and means for forcing air through the support, and connectionsf between the adjacent plates.

2. In an electrical heater, the combination with a hollow support having a perforated portion, of a series of plate resistance secured on the perforated portion, a resistance-coil surrounding the perforated portion and passingr into and out of the saine at the point where the plates are connected, and means 'for forcingr air through the perforations.

3. The combination with a perforated supporting;` member,0f a resistance-coil surrounding the same and having portions projecting into the support, and perforated disks tting over the supporting member and located thereon between The perforations with the turns of the coil surrounding said member between the plates; substantially as described.

4. An electric heater provided with a plurality of plates or disks, connections between the same, and a resistance-coil arranged longitudinally of the heater and with its turns occupying planes intermediate of the adjacent pairs of plates or disks; substantially as described.

5. An electric heating apparatus co1nprising a longitudinally-disposed perforated hollow pipe, boxes surrounding said pipe at separated points,a resistance-coil surrounding thc pipe in each box,and resistance plates or disks on said pipe disposed between the turns of the coil in each boX, substantially as described.

G. An electric heating apparatus comprising` a longitudinally-disposed perforated pipe, a box inclosing said pipe, a resistance-coil in said box and surrounding the pipe therein, and resistance plates or disks on said pipe disposed between the turns of thc resistance-coil, substantially as described.

In testimony whereof I a'l'lix my signature in presence of two witnesses.

MARTIN C. BUIR'I.

YVitncsses:

L. S. BACON, Jos. ll. MILANs. 

